Ralph scott



PATENTED 001". 11, 1504.

R. SCOTT. ELECTRIC ARC LAMP. APPLIOAT ION FILED 0OT.14, 1903 I I I I st hwiwro Q flrmmg N0 MODEL.

wihmaoeo To a, whmn it may concern;

UNITED STATES Patented October 11, 1904.

"PATENT OFFICE.

RALPH SCOTT. OF VVILKESBARRE, PENNSYLVANIA, ASSIGNO R OF ONE- HALF TO 'MARCUSA. MILLER, OF NEW YORK. N. Y

ELECTRIC-Ase LAMP.

SPECIFICATION forming part of Letters Patent No. 772,257, dated October 11, 1904.

Application filed October 14, 1903.

4 Bait known that I, RALPH Scorn. a citizen of the United States, residing at Wilkesbarre, in

the county of Luzerne and State-ofPennsylarc-lamp capable of use on acircuit of constant voltage-say, for example, one hundred and ten'-so that thelamp may be used on an ordinary incandescent-light circuit, a sufficient resistance being employed in the lamp to limit the current used by the lamp.

With these and further objects in view the invention comprises certain novel construc- "tions, combinations, and arrangements of parts, as will be hereinafterlfully described and claimed. r

1n the accompanying drawing the figure shows a vertical longitudinal central section through an arc-lamp embodying the features of the present invention.

Referring to'the drawing by numerals, 1 indicates. a suitable frame provided with means (not shown) for supporting a globe 2, inclosing theare. The frame 1 may be of any preferred contour provided with any conimon form, of support-engaging member 3, attached to the frame at its upper end. Withinthe frame, and preferably just beneath'the support engaging member 3, is positioned a vertically-arranged dash-pot 4, the plunger thereof (not illustrated) being the head of a carbon-tube said carbon-tube in practice inclosing a carbon pencil 6, having its upper end connected with suitable means for main taining perfect electrical :contact. with the tube -5, said contactingmeans-not being illustrated. .Asoft-iron core or plunger 7 surrounds the tube-5 "and is secured thereto by a set-screw 8, threaded through the plunger into contact lwithi 'said tube. 4 The plunger 7 may Serial No. 177,013: 41% model.)

i be DOSlLlUHGCl at any desired point in the length of the tube 5 for securing the greatest f efliciency from a given current, and said plungar-is provided at its lower end with anannular flange 9, adapted to vary the reluctance of the path of the-lines of force created by the electric magnet formed by'said plunger and a cylinder hereinafter described. Said'electromagnet consists, preferably, of a coil. 10 of a single winding of coarse wire surrounding the plunger 7 or a portion thereof and inclosed by a cylinder 11, of soft-iron. The upper end of the cylinder 11 is preferably provided with an inwardly-projecting annular shoulder 12, carrying a cylinder 13, of brass or other non-magnetic substance, said cylinder being of the length of cylinder 11 and extending down between the coil 10 and the plunger 7. 'The said upper end of thecylinder 1]. is provided with laterally-projecting which latter is insulated from the frameL The frame 1 is composed of conductive material and is connected by screws or othersuitable attaching means 18 18, connected to the cylinder 11, said attaching ineans'forming supports for said'cylinder and contacting parts, the cylinder 11 beiug thus grounded 7o flanges 14:. A bar of non-metallic material upon' the frame 1that is to say, said cylin- 1 der is electrically connected with said frame. A bar 19, of non-metallic material, similar-to :bar 15 and forming a resistance, restsupon and is insulated from the flange 14, the lower end of the bar 19 being connected electricallywith one end of coil 10. The bar 1 9"e x-'- tends upwardly from its support and 'is elec-- trically connected at its upper end with a binding-post 19, insulated, from the frame 1 and carried thereby.

The lower end of frame a plateQO, upon which .is mounted a guidingspider 21, surrounding tub-e5 and apertured to permit the passage of said tube, whereby 1 preferably carries the, lower end of said tube is limited against lateral play. The lower end of said tube is resistance of a thereto and carries at one side a pivotallyconnected link 23, said link depending from said collar and pivotally engaging at itsllower end a ring 24, surrounding carbon .6, whereby in operation upward movement of the tube 5 is adapted to bring the ring'2 t to an inclined position for causing its edges to bite said carbon and lift the same with the tube, said ring releasing the carbon upon being dropped into. contact with the plate 20.

Adepending bracket 25, of conductive ma;- terial, is supported by plate 20 and is insulated therefrom, a suitable conductor 26 connecting said bracket with the coil 10, said conductor extending, preferably, through an aperture formed in flange 9. The lower end of the bracket 25 is provided with any suitable engaging means for carrying a carbon pencil 27 below and in vertical hon 6.

' The circuit of the present lamp may be traced as follows: Starting with binding-post 17, the

current flows through conductor 16, resistance 15, flange 14, cylinder 11, frame 1, dash-pot 4, tube 5, carbon pencil 6, carbon pencil 27, bracket 25, conductor 26, coil 10, resistance 19, and to binding-post 19, bindingposts 19 and 17 being connected'to the line-wires;

In operation when a current is supplied to the lamp the flux from coil 10 will pick up plunger 7 thereby lifting tube. 5 and through the operation of the clutch carried thereby lift carbon pencil 6 from contact with carbon 27, thus forming the arc, Should the current vary or the arc of the lamp become too long for any reason, the decrease in the flux will permit the plunger 7 to descend for-compensating for such variation or for shortening the. arc, as necessary. I

The cylinder 11 forms a path of very little reluctance, and the flange 9 decreases the airgap and makes the parts extremely sensitive to variations in the current. Further, it will be observed that the resistance-bars 15 and 19 are connected in series to oiier double the single bar and at the same time leave ample space'within the frame 1 for the circulation of air for keeping the parts cool, said frame being preferably provided with suitable apertures, as illustrated, for the free admission of air.

While I maintain that the construction and arrangementof the resistances 15 and 19 are novel, I am presenting no'claims in the present application for the resistance per 8c, for the reason that I have claimed the same in a companion application filed even-date herewith.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, isx 1. In an arc-lamp, the combinatiouof a coil, a core within the same, a movable carbon-support actuated by said core, a casing inclosing alinemeut with the car carried by said piungen'a coil surrounded by a collar 22, which is fixed i said coil, a flange on said casing, anommetaltween the first-mentioned support and said casa plunger within the same, a-carhon-support actuated thereby, a cylinder inclosing said coil, 7

a flange projecting from the upper end of said cylinder, a pencil of resistance material sup ported by said flange and insulated therefrom, a carbon-support beneath the first-mentioned carbon-support, and electrical connections between said resistance and coil and between the coil and said last-mentioned support,

3. In an arc-lamp, the combination with a tube anda carbon-engaging clutch carried thereby, of a plunger surrounding said tube, an annular flange carried by said plunger, a coil surrounding said plunger, a soft-ironcasing surrounding said coil, a carbon-support beneath said tube. a resistance carried by and insulated from said casing, an electrical connection between the resistance insulated from said casing and said coil, a similar connection between said .coil and one of the carbon-supports, and electrical connections between the other of said carbon-supports andsaid casing. 4. In an arc-lamp, the combination with a frame, of a carbon-tube movably mounted therein, a plunger surrounding said tube, a flange carried by said plunger, a soft-iron cyiinder surrounding said plunger and grounded on said frame, a coil interposed between said cylinder and plunger, flanges on said cylinder, a resistance grounded on one of said flanges, a resistance carried by the flange and insulated therefrom, electrical connection between said insulated resistance and said coil, a carbon support beneath said tube, an electrical connection between said coil and said carbon-support, electrical connection between said car hon-tube and frame, line-wire binding-posts, and electrical connections between said posts and said resistances.

5. In an arc-lamp, the combination with a tube, and a carbon-engaging clutch carried thereby, of a plunger surrounding said tube and connected therewith, an annular flange surrounding said plunger, a soft-iron casing surrounding said coil, a carbon-support beneath said tube, a resistance carried by said casing, electrical connection between the resistance and said coil and one of the carbon-supports, and electrical connections between said tube and easing.

In testimony whereof I herchnto aiiix my signature in presence of two witnesses.

RALPH SCOTT Witnesses:

ALICE M. Mnrnns, GAssELL SEVERANCE.

g i ,2. In an arc-lamp, the combination of a coil, 

